Railway signaling



Oct. 20, 1931"- H. s. YOUNG sf AL RAILWAY SIGNALING v N R R1 Filed 001;. 31, 1929 N) w l 5 w N N 1 Q7 1 y Q; I Q

L N N a N {film g k -32 I INVENTORSI $5 Q N H-.S.Youn and 0.19. Brooks,

Ti ga-a w j ell) Patented Oct. 20, 1931 HENRY, s. YOUNG, or wILKINsBUne; AND CHARLES A. BROOKS, or 'swrssvnnnj iig eie;

sYLvANLa, ASSIGNOBS To'THE UNIoN SWITCH &'SIGNAL ooarPA v, or sw ssvann, R

rENNsYLvANIA, A oonrona'rron on PENNSYL ANIA v RAILWAY SIGNALING Application filed October 31,1929. Serial No. 403,7 39; l

r of a stretch of single track over which traffic moves in both directions,wvhich stretch is provided with a passin rsiding A. a, The rails are divided by insul the siding Ais included, an appro'achtrack section VV-X at one end of-othe siding,.and another approach section Y-Z at the'other' end of the siding. Track section is provided with a'track circuit comprising a battery 3 connected across the rails at the intermediate point inthe section, and'two tracks relays T and T connected withthe rails'at theopp'osite ends of the section respectively. The approach section WX is provided with a similar track circuit comprising a batteryB- and a track relay; T while the other approach section YZ is provided with a similar track circuit comprising a battery 3 and a track relay-T Trafiic into'the siding Aimoving from left to right is governed bya' signal S compris ing a proceed lamp G, a caution lamp "Y, and a stop lamp R. Traflic into this siding moving from rightto left is governediby] a similar signal S. Signal S iscontrolled by a line relay H while signal S 'is .eon--- trolled by a line relay H both of whichre' lays are of the polarizedtypa sothat; they are responsive to the polarity of the current by which they are energized.

ated joints 2 to" form a main track section X-Y, in which Line relay H is provided a repeater I relay R while line relay H is provided with a repeater relay R Associated. with .the

1 track relayT is avline relay H which relay in turn controls a pole-changingrelay PR Similarly associated 'with .a'; track relay T? is a line relay I-Itwhichlcontrols a pole-changing relayiP a r Line relay H is controlled by: a front con tact 5 of trackrelay T7 and by other appara-. tus to the left of point 'W' inaccordancewith far as: the present disclosure is concerned, the only important factor as-toffrelay H is :the

a suitable source of current,fithroughfront contact 6. of relay- H and the winding; of

relay-P to terminal 0 of'the same source of current- It follows that relay P 'isf'energized or ale-energized according as relay H is energized or de energized." Pole-changing.

relay P is controlled in a similar manner by a front contact 24 'ofxline' relay H f .R'e-

peater relay R is controlled by a front con:

tact 11 of relay H the circuit beingobvious from the drawing. .Repea'ter relay B lS'COIl trolled-in a similar manner by frontcontact 18 0frelayI-I LU:

in'g incharacter;

Line relay 7 Circuit which '-passes :from. terminal B, through thefront point of contact 8 of relay standard absolutex permissive block :signal '1 practice for" single trackgrail-waysfl In so,

'60 fact that-1t 1s. energized-or de-energized ac; cording'as trackrelay T -1s energized or del- The repeater relaysR and: the pole'-chang-' 5 I ingirelays P, are preferably'all slow-releas- H is providedwithfa H P?,1front pointof c ontact' l voftrack relay T front contact 9 of trackrelay T front contact 16 'of track relay T winding of i relay H andthe front point of contact? of 90 relay P to terminal 0. When this circuit is closed, current of normal polarity is supplied to this circuit, so that relay H is energlzed 1n normal direction, whereby its polar contact 19 Y is swung to the left. When relay P is deenergized, and all other contacts in the circuit for relay H are closed, the circuit is the same (as before except that current of reverse polarity is supplied to relay H in which event its polarv contact 19 is swung tothe right. Relay: H is provided with anauxiliary circuit which is closed when track relay T v and repeater relayR; are both de-energized, in

which event, of course, pole-changing relay P is also dc-energized. This auxiliary c1r-' cult is from terminal B through back point of contact 7 of relay P winding of relay H track relay contacts 16 and 9, back point oi.

" contact {of track relay T back contact'13 of relay R and the back point of contact 802E relay P to terminal 0. When this circum is closed, relay H is energized'by current ofreverse polarity.

,Lineerelay'H is provided with a similar main circuit Whichpasses'from terminalB,

through. front pointlot contact of relay Pt, 'front pointof contact 22 of track: relay T contact 15 of track relay T ,'co ntact1O 0=f trackzrelay- T winding .of relay I-P, and

theufront pointof contact 260i? relay P to terminal1O:v Relay H is providedwith an auxiliary circuit -which passes from. terminal :B, throughthe back pointofcontact 26 of relay P vinding of relay-H contact 10 of track relay T3, contact'15oftrack relay T back point of contact 22 of track relay T back contact 20 oftrack relay R back contact'17 of relay H and the back point 0t.contact'25:ofrelayfPt to terminal'C). This circuit corresponds to the auxiliary circuit,

direction, theacaut-io-n' lamp Y is, lighted, the

circuit :beingthe sameas before, except that it includes polar contact 12 in the right-hand positi'on,a11d,;of course, itlincludes the cautionlampwY. 1 When relay H is de-enerfgized, relay R is also ole-energized, and the stop=,: laInp-"Rof signal S is then; lighted by V1lt1l6"0f a circuit; whichincludeswthis lamp and the back point of contact .14 of relay R The lamps of signal S are controlled in a similar imanner 'by contact 21 0t relay R yand polar contact 19 of. relay-'H l he :operation of the apparatus; is as follows: lVe will first assume that a train moving toward the right enters the approach section lVX,thereby de-energizing track relay T This will open the circuit for line relay H at contact 4, so that signal S will immediately assume the stop indication. We will now assume that While section WX is occupied by a first train, a second train moving toward the'left enters the approach section Y-Z. In accordance with previous practice, this would cause signal S3 to assume the stop indication, so that the first train would have to stop at point X prior to entering siding A. Owing, however, to the auxiliary circuit for relay H the entrance of the-second train into section Y"Z will cause relay H to become energized in the reverse direction, thereby causing signal S to give a caution indication, with the result that the train in section lV-X may proceed into the siding A without the necessitytor stopping at point X. a

i Similarly, if av train moving: toward-"uh left enters section YZ while the other approach section is unoccupied, the openingiof track relay '1" will open the circuit of line relay H so that signal S will give the stop indication. If then, a second train-enters section WX moving toward the right,- the auxiliary circuit for relay- H will become closed, with the result: that signal S will give the caution indicatiom'thereby permit- 1 ting 'the train movingitoward the leftto en tenthe siding 'A withoutv stopping 'atthe point Y. i

-Tlie reasonfor including back contact 17 of relay: H? in the auxiliary circuit for relay H as followsz We will assume that one train isin' section X'Y:"and a'following train: is in section then when the first train advancesinto: section Y-Z, relaystH and H will both pick :upv at vthe same time, and this will tend to pick upboth relays R andR at the same time, with the result that the circuits for relaysfHF antl'l-l would be opened. This would :be likelyito 7 cause a bobbing action of the line relays. aOwing to the fact that contact 17 of relay H iis included in the auxiliary circuit for relay H thelcircuit'for relay H will be opened as soon as the back contact ofrelay H -opens, thereby eliminating the possibility of'the bobbing action ust referred to.

Although we have herein shown-and described only-one formof apparatus embody ing ourinventiomit'is understood thatvvarious changes and .modifications may be made therein within; thescope iof the appended claims without departing-from the spirit and scope of ourinvention. i i

- Having thus described our invention, what weclaim is:- I r r I 1.. In combination, a stretchof single track railway providedwith avpassing siding, Sig-- nals at each endof said SldlIIg gOVBI'IIlHg traific through the siding, means normally re:

sponsive to a train approaching the siding v from either direction for causing the opposing signal to indicate stop, and means for pre-1 "nal to indicate stop, and means for prevent-' 4 ing such train from causing said signal to indicate stop when another train moving in the direction governed by thesignal is al-..

ready approaching the siding. f v V 3. In combination, a stretch of single track railway provided with a passing siding, signals at each end of said siding governing traflic through the siding, means normally responsive to a train approaching the siding from either direction for causing the opposing signal to indicate stop, and means responsive to a second train approaching the siding for causing the opposing signal to indicate caution when a first train is already ap proaching the siding from the other direction.

4:. In combination, a stretch of railway track provided with a passingsiding, a signal governing traflic in one direction through said siding, means normally responsive to a trainmoving in the other direction and approaching said siding for causing said signal to indicate stop, and means responsiveto the approach of such train for causingethe signal to indicate caution when another train moving in the direction governed by the signal is already approaching the siding. I

v In combination, a stretch of single track railway provided with a passing siding, signals governing trafiic from opposite directions into said siding, an approach section at each end of said siding, means normally responsive to the entrance of a train into either of said sections for causing the opposing signal to indicate stop, and means for preventing a second train entering one of said sections from causing the opposing signal to indicate stop when a first train already occupies the other section. i

6. In combination, a stretch of single track railway provided, with a passing siding, signals governing traffic from opposite direc-v tions into said siding, an approach section at each end of said siding, means normally responsive to the entrance of a train into either of said sections for'causing the opposing signal to indicate stop,- and means responsiveto a second train enterlngone of said sections for causing the opposing signal to indicate caution when a first train already occupies the other section.

7. In combination, a stretch of singletrack railway provided with a passing siding, an,

approach section at, each end ofsaid siding, a track oircuit including a track'relayior each approachsection, a line relay for .each

the app-roach section track relay atuthe other end oftthe siding, an auxiliary circuit 1 for end of said siding, 'a normal circuit for each line relay controlled by a front contact of each line relay controlled by a back contact of the'approach section track relay at the otherend of the section and'also by the otherline relay, and signals for said siding controlled by saidline relays.

8. In combination, a stretch of single track I railway provided with a passing siding, an approach se'ctionat each end of said siding, a track circuit including a track relay for each approach section, a line relay for each end of said siding, a repeater relay con,-

trolled by each linerelay,a normal circuit for 1 each line relay including a front contact of the track relay of the approach section at the other end of the siding, an auxiliary circuit for each line relay including a back contact of 3 the track relay of the approach section at'the other end of the-siding and a back contact of the line repeater relay at such other end of.

the siding, and signals for said siding controlled by said line relays.

9. In combination, a stretch of single track" I railway provided with a passing siding, an 10( approach section at each end of said siding,

a track circuit including a track relay for each approachsection, a line relay for each 1 end of said siding, a repeater relay controlled by each line relay, a normal circuit for each line relay including a front contact of'the track relay of the approachsection at the other end of the siding, an auxiliary circuit for each line relay including a back contact of the track relay of the approachsection at the other end of the siding and a back contact of the line repeater relay at such other end of the siding, the auxiliary circuit'for one line relay including also a back contact of the other line relay, and signals for said siding controlled by said line relays.

10. In combination, a stretch of single track railway provided with a passing siding, an approach section at each end of said siding, a track circuit including a track relay for each approach section, a pole-changing relay controlled by each track relay, a

line relay for each end of said siding,'a repeater relay controlled by each line relay, a

normal circuit for each line relay including a front contact of the track relay of the approach section at the other end of the sid-V ing, an auxiliary circuit for eachline relay including a back contact of the track relay of the approach sectionvat the other end of' the siding and a back contact of the line repeater relay at such other'end 0 5x116 slid: ing, means for supplying current 'ofnormal erwreverse polarity to' the circuits-for each line relay accordingas the pole-changing relay at the opposite end of thesiding is:en ergized ordeeenergized', and a siding signal controlled by each line'relay and arranged to indicate preceed or scaution according as or reverse polarity.

the relay is supplied with current ofnormal In testimony whereof We affix our signatures. V Y

= V :HENRYS. YOUNG.

" I CHARLES BROOKS. 

